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    Question

    The sum at a certain rate of simple interest becomes Rs.

    14880 after 3 years and Rs,16800 after 5 years. Find the simple interest on the same sum at 10% per annum for 4 years (in Rs.)
    A 5660 Correct Answer Incorrect Answer
    B 5600 Correct Answer Incorrect Answer
    C 4800 Correct Answer Incorrect Answer
    D 4860 Correct Answer Incorrect Answer

    Solution

    year       amount 3             14880......(1) 5             16800......(2) difference between eques (1) and (2) 2             =1920 1             =960 equation (1) then interest = 3×960=2880 P=A-SI=14880-2880=12000 P=1200 so now simple interest on the same sum r=10%, t=4year SI= PRT/100 =12000×10×4/100 =4800rs              

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